Step 1: In a shaker or sturdy glass, muddle the blackberries and mint together until fully broken down. This extracts the berry juice and mint oils.
Step 2: Add lemon juice, orange juice, and honey syrup to the mixture. Stir or shake briefly to combine and chill.
Step 3: Fine strain the mixture into a highball or rocks glass filled with crushed ice. This ensures a smooth drink without pulp or leaves.
Step 4: Top with sparkling water and gently stir to mix. Avoid over-stirring to preserve the bubbles.
Step 5: Garnish with a lemon wheel and a fresh mint sprig just before serving. Serve immediately while cold and fizzy.